I wonder how they simulate the displacement of water since it's not from how tsunamis usually occur. A lot of water you think would be vaporised into the air and moved with the shockwaves. Plus there is only so much water at the impact site, not an unlimited amount. Given the speed of the impact, would it move as much water? They say when you jump off a bridge, the impact is like hitting cement.
As far as i know, the earth's crust below and around the impact gets displaced by a fair amount. I think the crust acts like a rubber sheet bouncing backwards and forwards. This most likely contributes toward the displacement of water above.
That reminds me, I remember reading some NASA stuff my dad would bring home talking about simulations of impacts. While there are very few on earth there are vast numbers on the moon and other planets.
I think the forces and energies are so large that the fluid dynamics dominate.
